/* packet-elasticsearch.c
 *
 * Routines for dissecting Elasticsearch
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */
#include "config.h"

#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/tfs.h>
#include "packet-tcp.h"

#define ELASTICSEARCH_DISCOVERY_PORT 54328 /* Not IANA registered */
#define ELASTICSEARCH_BINARY_PORT 9300 /* Not IANA registered */

#define ELASTICSEARCH_HEADER_SIZE_VERSION 7060099 /* First version to support variable header size */
#define ELASTICSEARCH_THREAD_CONTEXT_VERSION 5000099 /* First version to include the thread context */
#define ELASTICSEARCH_FEATURES_VERSION 6030099 /* First version which includes a feature list */

#define IPv4_ADDRESS_LENGTH 4
#define ELASTICSEARCH_STATUS_FLAG_RESPONSE 1   /* 001 */
#define ELASTICSEARCH_STATUS_FLAG_ERROR 2      /* 010 */
#define ELASTICSEARCH_STATUS_FLAG_COMPRESSED 4 /* 100 */

#define ELASTICSEARCH_VERSION_LABEL_LENGTH 19 /* This many characters: XX.XX.XX (XXXXXXXX) */
#define ELASTICSEARCH_HEADER_LENGTH 6 /* Bytes 3-6 are the length, 1-2 is the magic number */

#define ELASTICSEARCH_MESSAGE_LENGTH_OFFSET 2
#define ELASTICSEARCH_BINARY_HEADER_TOKEN 0x4553
#define BITS_IN_A_BYTE 8
typedef struct {
    int length;
    int value;
} vint_t;

typedef struct {
    vint_t vint_length;
    int length;
    char *value;
} vstring_t;

typedef struct {
    int length;
    int value;
    char string[9];
} version_t;

void proto_register_elasticsearch(void);
void proto_reg_handoff_elasticsearch(void);

static dissector_handle_t elasticsearch_handle_binary;
static dissector_handle_t elasticsearch_zen_handle;

static int proto_elasticsearch;

/* Fields */
static int hf_elasticsearch_internal_header;
static int hf_elasticsearch_version;
static int hf_elasticsearch_ping_request_id;
static int hf_elasticsearch_cluster_name;
static int hf_elasticsearch_node_name;
static int hf_elasticsearch_node_id;
static int hf_elasticsearch_host_name;
static int hf_elasticsearch_host_address;
static int hf_elasticsearch_address_type;
static int hf_elasticsearch_address_format;
static int hf_elasticsearch_address_name;
static int hf_elasticsearch_address_length;
static int hf_elasticsearch_address_ipv4;
static int hf_elasticsearch_address_ipv6;
static int hf_elasticsearch_address_ipv6_scope_id;
static int hf_elasticsearch_attributes_length;
static int hf_elasticsearch_address_port;
static int hf_elasticsearch_header_token;
static int hf_elasticsearch_header_message_length;
static int hf_elasticsearch_header_request_id;
static int hf_elasticsearch_header_status_flags;
static int hf_elasticsearch_header_status_flags_message_type;
static int hf_elasticsearch_header_status_flags_error;
static int hf_elasticsearch_header_status_flags_compression;
static int hf_elasticsearch_header_size;
static int hf_elasticsearch_header_request;
static int hf_elasticsearch_header_response;
static int hf_elasticsearch_header_key;
static int hf_elasticsearch_header_value;

static int hf_elasticsearch_feature;
static int hf_elasticsearch_action;
static int hf_elasticsearch_data;
static int hf_elasticsearch_data_compressed;

/* Expert info */
static expert_field ei_elasticsearch_unsupported_version;
static expert_field ei_elasticsearch_unsupported_address_format;
static expert_field ei_elasticsearch_unsupported_address_type;


/* Trees */
static int ett_elasticsearch;
static int ett_elasticsearch_address;
static int ett_elasticsearch_discovery_node;
static int ett_elasticsearch_status_flags;
static int ett_elasticsearch_header;

/* Forward declarations */
static int dissect_elasticsearch_zen_ping(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data);

static const value_string address_types[] = {
    { 0x0, "Dummy" },
    { 0x1, "Inet Socket" },
#define ADDRESS_TYPE_SOCKET 0x1
    { 0x2, "Local" },
    { 0, NULL }
};

static const value_string address_format[] = {
#define ADDRESS_FORMAT_NUEMRIC 0x0
    { 0x0, "Numeric" },
#define ADDRESS_FORMAT_STRING 0x1
    { 0x1, "String" },
    { 0, NULL }
};

static const value_string status_flag_message_type[] = {
    { 0x0, "Request" },
    { 0x1, "Response" },
    { 0, NULL }
};

static void elasticsearch_format_version(char *buf, uint32_t value) {
    snprintf(buf, ELASTICSEARCH_VERSION_LABEL_LENGTH, "%d.%d.%d (%d)", (value / 1000000) % 100,
            (value / 10000) % 100, (value/ 100) % 100, value);
}

static vint_t read_vint(tvbuff_t *tvb, int offset){
    /* See: org.elasticsearch.common.io.stream.StreamInput#readVInt */
    vint_t vint;
    uint8_t b = tvb_get_uint8(tvb, offset);
    vint.value = b & 0x7F;
    if ((b & 0x80) == 0) {
        vint.length = 1;
        return vint;
    }
    b = tvb_get_uint8(tvb, offset+1);
    vint.value |= (b & 0x7F) << 7;
    if ((b & 0x80) == 0) {
        vint.length = 2;
        return vint;
    }
    b = tvb_get_uint8(tvb, offset+2);
    vint.value |= (b & 0x7F) << 14;
    if ((b & 0x80) == 0) {
        vint.length = 3;
        return vint;
    }
    b = tvb_get_uint8(tvb, offset+3);
    vint.value |= (b & 0x7F) << 21;
    if ((b & 0x80) == 0) {
        vint.length = 4;
        return vint;
    }
    b = tvb_get_uint8(tvb, offset+4);
    vint.length = 5;
    vint.value |= ((b & 0x7F) << 28);
    return vint;
}

static vstring_t read_vstring(wmem_allocator_t *scope, tvbuff_t *tvb, int offset) {
    vstring_t vstring;
    int string_starting_offset;
    int string_length;

    vstring.vint_length = read_vint(tvb, offset);
    string_starting_offset = offset + vstring.vint_length.length;
    string_length = vstring.vint_length.value;

    vstring.value = tvb_get_string_enc(scope, tvb, string_starting_offset, string_length, ENC_UTF_8);
    vstring.length = string_length + vstring.vint_length.length;

    return vstring;
}

static int elasticsearch_partial_dissect_address(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset) {
    proto_tree *address_tree;
    proto_item *address_item;
    int start_offset;
    uint8_t es_address_format;
    uint8_t address_length;
    vstring_t address_name;
    uint16_t address_type_id;

    /* Store this away for later */
    start_offset = offset;

    /* Address tree */
    address_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_elasticsearch_address, &address_item, "Address" );

    /* Address type */
    proto_tree_add_item(address_tree, hf_elasticsearch_address_type, tvb, offset, 2, ENC_BIG_ENDIAN);
    address_type_id = tvb_get_ntohs(tvb, offset);
    offset += 2;
    /* Only socket address types are supported (and only make sense to be supported) */
    if(address_type_id != ADDRESS_TYPE_SOCKET) {
        expert_add_info(pinfo, tree, &ei_elasticsearch_unsupported_address_type);
        return offset;
    }

    /* Address format */
    es_address_format = tvb_get_uint8(tvb, offset);
    proto_tree_add_item(address_tree, hf_elasticsearch_address_format, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    switch(es_address_format) {
        case ADDRESS_FORMAT_NUEMRIC:
            address_length = tvb_get_uint8(tvb, offset);
            proto_tree_add_item(address_tree, hf_elasticsearch_address_length, tvb, offset, 1, ENC_BIG_ENDIAN);
            offset += 1;
            /* Its either IPv4 or IPv6 depending on the length */
            if (address_length == IPv4_ADDRESS_LENGTH) {
                proto_tree_add_item(address_tree, hf_elasticsearch_address_ipv4, tvb, offset, 4, ENC_NA);
                offset += 4;
            }
            else {
                proto_tree_add_item(address_tree, hf_elasticsearch_address_ipv6, tvb, offset, 16, ENC_NA);
                offset += 16;
                proto_tree_add_item(address_tree, hf_elasticsearch_address_ipv6_scope_id, tvb, offset, 4, ENC_BIG_ENDIAN);
                offset += 4;
            }
            break;

        case ADDRESS_FORMAT_STRING:
            address_name = read_vstring(pinfo->pool, tvb, offset);
            proto_tree_add_string(address_tree, hf_elasticsearch_address_name, tvb, offset, address_name.length, address_name.value);
            offset += address_name.length;
            break;

        default:
            /* Shouldn't get here, invalid format type */
            expert_add_info(pinfo, tree, &ei_elasticsearch_unsupported_address_format);
            break;
    }

    proto_tree_add_item(address_item, hf_elasticsearch_address_port, tvb, offset, 4, ENC_BIG_ENDIAN);
    offset += 4;

    /* Fix up the length of the subtree */
    proto_item_set_len(address_item, offset - start_offset);

    return offset;
}

static version_t elasticsearch_parse_version(tvbuff_t *tvb, int offset){
    version_t version;
    vint_t raw_version_value;

    raw_version_value = read_vint(tvb, offset);
    version.length = raw_version_value.length;
    version.value = raw_version_value.value;
    snprintf(version.string, sizeof(version.string), "%d.%d.%d", (version.value / 1000000) % 100,
            (version.value / 10000) % 100, (version.value/ 100) % 100);

    return version;
}

static int dissect_elasticsearch_zen_ping(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_){
    int offset = 0;
    version_t version;
    vstring_t cluster_name;
    vstring_t node_name;
    vstring_t node_id;
    vstring_t host_name;
    vstring_t host_address;
    vint_t attributes_length;
    version_t node_version;
    proto_item *root_elasticsearch_item;
    proto_tree *elasticsearch_tree;
    proto_tree *discovery_node_tree;
    proto_item *discovery_node_item;


    col_set_str(pinfo->cinfo, COL_PROTOCOL, "Elasticsearch");
    col_clear(pinfo->cinfo, COL_INFO);

    root_elasticsearch_item = proto_tree_add_item(tree, proto_elasticsearch, tvb, 0, -1, ENC_NA);
    elasticsearch_tree = proto_item_add_subtree(root_elasticsearch_item,ett_elasticsearch);

    /* Let the user know its a discovery packet */
    col_set_str(pinfo->cinfo, COL_INFO, "Zen Ping: ");


    /* Add the internal header */
    proto_tree_add_item(elasticsearch_tree, hf_elasticsearch_internal_header, tvb, offset, 4, ENC_BIG_ENDIAN);
    offset += 4;

    /* Add the variable length encoded version string */
    version = elasticsearch_parse_version(tvb, offset);
    proto_tree_add_uint(elasticsearch_tree, hf_elasticsearch_version, tvb, offset, version.length, version.value);
    offset += version.length;

    /* Ping request ID */
    proto_tree_add_item(elasticsearch_tree, hf_elasticsearch_ping_request_id, tvb, offset, 4, ENC_BIG_ENDIAN);
    offset += 4;

    /* Cluster name */
    cluster_name = read_vstring(pinfo->pool, tvb, offset);
    proto_tree_add_string(elasticsearch_tree, hf_elasticsearch_cluster_name, tvb, offset, cluster_name.length, cluster_name.value);
    col_append_fstr(pinfo->cinfo, COL_INFO, "cluster=%s", cluster_name.value);
    offset += cluster_name.length;


    /* Discovery node tree */
    discovery_node_tree = proto_tree_add_subtree(elasticsearch_tree, tvb, offset, -1, ett_elasticsearch_discovery_node, &discovery_node_item, "Node" );

    /* Node name */
    node_name = read_vstring(pinfo->pool, tvb, offset);
    proto_tree_add_string(discovery_node_tree, hf_elasticsearch_node_name, tvb, offset, node_name.length, node_name.value);
    col_append_fstr(pinfo->cinfo, COL_INFO, ", name=%s", node_name.value);
    offset += node_name.length;

    col_append_fstr(pinfo->cinfo, COL_INFO, ", version=%s", version.string);


    /* Node ID */
    node_id = read_vstring(pinfo->pool, tvb, offset);
    proto_tree_add_string(discovery_node_tree, hf_elasticsearch_node_id, tvb, offset, node_id.length, node_id.value);
    offset += node_id.length;

    /* Hostname */
    host_name = read_vstring(pinfo->pool, tvb, offset);
    proto_tree_add_string(discovery_node_tree, hf_elasticsearch_host_name, tvb, offset, host_name.length, host_name.value);
    offset += host_name.length;

    /* Host address */
    host_address = read_vstring(pinfo->pool, tvb, offset);
    proto_tree_add_string(discovery_node_tree, hf_elasticsearch_host_address, tvb, offset, host_address.length, host_address.value);
    offset += host_address.length;

    /* Address */
    offset = elasticsearch_partial_dissect_address(tvb, pinfo, discovery_node_tree, offset);

    /* Attributes. These are zero for discovery packets */
    attributes_length = read_vint(tvb, offset);
    proto_tree_add_uint(discovery_node_tree, hf_elasticsearch_attributes_length, tvb, offset, attributes_length.length, attributes_length.value);
    offset += attributes_length.length;

    /* Version again */
    node_version = elasticsearch_parse_version(tvb, offset);
    proto_tree_add_uint(elasticsearch_tree, hf_elasticsearch_version, tvb, offset, node_version.length, node_version.value);
    offset += node_version.length;

    return offset;
}

static int elasticsearch_binary_header_is_valid(tvbuff_t *tvb){
    /* Header was introduced in V0.20.0RC1. At the moment I'm not supporting versions before this
    *  See: org.elasticsearch.transport.netty.NettyHeader#writeHeader
    * */
    return tvb_captured_length(tvb) >= 2 && tvb_get_ntohs(tvb, 0) == ELASTICSEARCH_BINARY_HEADER_TOKEN;
}

static int elasticsearch_transport_status_flag_is_a_response(int8_t transport_status_flags) {
    return transport_status_flags & ELASTICSEARCH_STATUS_FLAG_RESPONSE;
}

static int transport_status_flag_is_a_request(int8_t transport_status_flags){
    return !elasticsearch_transport_status_flag_is_a_response(transport_status_flags);
}

static int elasticsearch_is_compressed(int8_t transport_status_flags){

    return transport_status_flags & ELASTICSEARCH_STATUS_FLAG_COMPRESSED;
}

static void elasticsearch_decode_binary_request(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, int8_t transport_status_flags, uint32_t version) {

    int i;
    vint_t features;
    vstring_t action, feature;

    if(elasticsearch_is_compressed(transport_status_flags)){
        proto_tree_add_item(tree, hf_elasticsearch_data_compressed, tvb, offset, -1, ENC_NA);
        col_append_str(pinfo->cinfo, COL_INFO, "[COMPRESSED], ");
    } else {
        if (version >= ELASTICSEARCH_FEATURES_VERSION) {
            features = read_vint(tvb, offset);
            offset += features.length;
            for (i = 0; i < features.value; i++) {
                feature = read_vstring(pinfo->pool, tvb, offset);
                proto_tree_add_string(tree, hf_elasticsearch_feature, tvb, offset, feature.length, feature.value);
                offset += feature.length;
            }
        }

        action = read_vstring(pinfo->pool, tvb, offset);
        proto_tree_add_string(tree, hf_elasticsearch_action, tvb, offset, action.length, action.value);
        col_append_fstr(pinfo->cinfo, COL_INFO, "action=%s, ", action.value);
        offset += action.length;
        proto_tree_add_item(tree, hf_elasticsearch_data, tvb, offset, -1, ENC_NA);
    }
}

static void append_status_info_to_column(packet_info *pinfo, int8_t transport_status_flags) {
    if(transport_status_flags & ELASTICSEARCH_STATUS_FLAG_ERROR){
        col_append_str(pinfo->cinfo, COL_INFO, "[ERROR], ");
    }else{
        col_append_str(pinfo->cinfo, COL_INFO, "[OK], ");
    }
}

static void elasticsearch_decode_binary_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, int8_t transport_status_flags, uint32_t version _U_) {
    append_status_info_to_column(pinfo, transport_status_flags);
    if(elasticsearch_is_compressed(transport_status_flags)){
        col_append_str(pinfo->cinfo, COL_INFO, "[COMPRESSED], ");
        proto_tree_add_item(tree, hf_elasticsearch_data_compressed, tvb, offset, -1, ENC_NA);
    } else {
        proto_tree_add_item(tree, hf_elasticsearch_data, tvb, offset, tvb_reported_length_remaining(tvb, offset), ENC_NA);
    }

}

static int elasticsearch_dissect_valid_binary_packet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_){

    int i, j;
    int offset = 0;
    int8_t transport_status_flags;
    uint32_t version;
    uint64_t request_id;
    vint_t request_headers, response_headers;
    vstring_t header_key;
    vint_t header_values;
    vstring_t header_value;
    proto_item *header_item;
    proto_tree *header_tree;
    proto_item *transport_status_flags_item;
    proto_tree *transport_status_flags_tree;

    /* Dissects:
     * Request:  org.elasticsearch.transport.netty.NettyTransport#sendRequest
     * Response: org.elasticsearch.transport.netty.NettyTransportChannel#sendResponse
     */

    /* org.elasticsearch.transport.netty.NettyHeader#writeHeader
    *
    * Token/Magic number that is at the start of all ES packets
    */
    proto_tree_add_item(tree, hf_elasticsearch_header_token, tvb, offset, 2, ENC_ASCII);
    offset += 2;

    /* Message length */
    proto_tree_add_item(tree, hf_elasticsearch_header_message_length, tvb, offset, 4, ENC_BIG_ENDIAN);
    offset += 4;

    /* Request ID */
    proto_tree_add_item(tree, hf_elasticsearch_header_request_id, tvb, offset, 8, ENC_BIG_ENDIAN);
    request_id = tvb_get_ntoh64(tvb, offset);
    offset += 8;

    /* Transport status: org.elasticsearch.transport.support.TransportStatus */
    transport_status_flags = tvb_get_uint8(tvb, offset);
    transport_status_flags_item = proto_tree_add_uint(tree, hf_elasticsearch_header_status_flags, tvb, offset, 1, transport_status_flags);
    transport_status_flags_tree = proto_item_add_subtree(transport_status_flags_item, ett_elasticsearch_status_flags);
    if(elasticsearch_transport_status_flag_is_a_response(transport_status_flags)){
        col_append_str(pinfo->cinfo, COL_INFO, "Response: ");
    } else {
        col_append_str(pinfo->cinfo, COL_INFO, "Request: ");
    }
    proto_tree_add_bits_item(transport_status_flags_tree, hf_elasticsearch_header_status_flags_compression, tvb, offset * BITS_IN_A_BYTE + 5, 1, ENC_BIG_ENDIAN);
    proto_tree_add_bits_item(transport_status_flags_tree, hf_elasticsearch_header_status_flags_error, tvb, offset * BITS_IN_A_BYTE + 6, 1, ENC_BIG_ENDIAN);
    proto_tree_add_bits_item(transport_status_flags_tree, hf_elasticsearch_header_status_flags_message_type, tvb, offset * BITS_IN_A_BYTE + 7, 1, ENC_BIG_ENDIAN);
    offset += 1;

    /* Version  */
    proto_tree_add_item_ret_uint(tree, hf_elasticsearch_version, tvb, offset, 4, ENC_BIG_ENDIAN, &version);
    offset += 4;

    /* Variable header size */
    if (version >= ELASTICSEARCH_HEADER_SIZE_VERSION) {
        proto_tree_add_item(tree, hf_elasticsearch_header_size, tvb, offset, 4, ENC_BIG_ENDIAN);
        offset += 4;
    }

    if (version >= ELASTICSEARCH_THREAD_CONTEXT_VERSION) {
        /* Request headers */
        request_headers = read_vint(tvb, offset);
        offset += request_headers.length;
        for (i = 0; i < request_headers.value; i++) {
            header_key = read_vstring(pinfo->pool, tvb, offset);
            header_value = read_vstring(pinfo->pool, tvb, offset + header_key.length);

            header_item = proto_tree_add_item(tree, hf_elasticsearch_header_request, tvb, offset, header_key.length + header_value.length, ENC_NA);
            header_tree = proto_item_add_subtree(header_item, ett_elasticsearch_header);

            proto_tree_add_string(header_tree, hf_elasticsearch_header_key, tvb, offset, header_key.length, header_key.value);
            proto_tree_add_string(header_tree, hf_elasticsearch_header_value, tvb, offset + header_key.length, header_value.length, header_value.value);

            proto_item_append_text(header_item, ": %s: %s", header_key.value, header_value.value);

            offset += header_key.length;
            offset += header_value.length;
        }

        /* Response headers */
        response_headers = read_vint(tvb, offset);
        offset += response_headers.length;
        for (i = 0; i < response_headers.value; i++) {
            header_item = proto_tree_add_item(tree, hf_elasticsearch_header_response, tvb, offset, 0, ENC_NA);
            header_tree = proto_item_add_subtree(header_item, ett_elasticsearch_header);

            header_key = read_vstring(pinfo->pool, tvb, offset);
            proto_tree_add_string(header_tree, hf_elasticsearch_header_key, tvb, offset, header_key.length, header_key.value);
            proto_item_append_text(header_item, ": %s", header_key.value);
            offset += header_key.length;

            header_values = read_vint(tvb, offset);
            offset += header_values.length;

            for (j = 0; j < header_values.value; j++) {
                header_value = read_vstring(pinfo->pool, tvb, offset);
                proto_tree_add_string(header_tree, hf_elasticsearch_header_value, tvb, offset, header_value.length, header_value.value);
                proto_item_append_text(header_item, j > 0 ? ", %s" : "%s", header_value.value);
                offset += header_value.length;
            }

            proto_item_set_end(header_item, tvb, offset);
        }
    }

    /* Only requests have features and actions */
    if (transport_status_flag_is_a_request(transport_status_flags)) {
        elasticsearch_decode_binary_request(tvb, pinfo, tree, offset, transport_status_flags, version);
    } else {
        elasticsearch_decode_binary_response(tvb, pinfo, tree, offset, transport_status_flags, version);
    }
    col_append_fstr(pinfo->cinfo, COL_INFO, "request_id=%"PRIu64" ", request_id);


    /* Everything is marked as data, return the whole tvb as the length */
    return tvb_captured_length(tvb);
}

static unsigned elasticsearch_get_binary_message_len(packet_info *pinfo _U_, tvbuff_t *tvb,
                                                  int offset, void *data _U_)
{
    /* length is two bytes into the packet, also the length doesn't include the starting 6 bytes */
    return (unsigned)tvb_get_ntohl(tvb, offset+ELASTICSEARCH_MESSAGE_LENGTH_OFFSET) + ELASTICSEARCH_HEADER_LENGTH;
}

static int dissect_elasticsearch_binary(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data) {

    int offset = 0;
    proto_item *root_elasticsearch_item;
    proto_tree *elasticsearch_tree;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "Elasticsearch");
    col_clear(pinfo->cinfo, COL_INFO);

    root_elasticsearch_item = proto_tree_add_item(tree, proto_elasticsearch, tvb, 0, -1, ENC_NA);
    elasticsearch_tree = proto_item_add_subtree(root_elasticsearch_item,ett_elasticsearch);

    if(elasticsearch_binary_header_is_valid(tvb)){
        /* pass all packets through TCP-reassembly */
        tcp_dissect_pdus(tvb, pinfo, elasticsearch_tree, true, ELASTICSEARCH_HEADER_LENGTH,
                elasticsearch_get_binary_message_len, elasticsearch_dissect_valid_binary_packet, data);
    } else {
        proto_tree_add_item(elasticsearch_tree, hf_elasticsearch_data, tvb, offset, -1, ENC_NA);
        expert_add_info(pinfo, elasticsearch_tree, &ei_elasticsearch_unsupported_version);
    }

    return tvb_captured_length(tvb);
}

void proto_register_elasticsearch(void) {

    static hf_register_info hf[] = {
        { &hf_elasticsearch_internal_header,
            { "Internal header", "elasticsearch.internal_header",
                FT_UINT32, BASE_HEX,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_version,
            { "Version", "elasticsearch.version",
                FT_UINT32, BASE_CUSTOM,
                CF_FUNC(elasticsearch_format_version), 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_ping_request_id,
            { "Ping ID", "elasticsearch.ping_request_id",
                FT_UINT32, BASE_DEC,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_cluster_name,
            { "Cluster name", "elasticsearch.cluster_name",
                FT_STRING, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_node_name,
            { "Node name", "elasticsearch.node_name",
                FT_STRING, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_node_id,
            { "Node ID", "elasticsearch.node_id",
                FT_STRING, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_host_name,
            { "Hostname", "elasticsearch.host_name",
                FT_STRING, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_host_address,
            { "Host address", "elasticsearch.host_address",
                FT_STRING, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_address_type,
            { "Type", "elasticsearch.address.type",
                FT_UINT16, BASE_DEC,
                VALS(address_types), 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_address_format,
            { "Format", "elasticsearch.address.format",
                FT_UINT8, BASE_DEC,
                VALS(address_format), 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_address_name,
            { "Name", "elasticsearch.address.name",
                FT_STRING, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_address_length,
            { "Length", "elasticsearch.address.length",
                FT_UINT8, BASE_DEC,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_address_ipv4,
            { "IP", "elasticsearch.address.ipv4",
                FT_IPv4, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_address_ipv6,
            { "IP", "elasticsearch.address.ipv6",
                FT_IPv6, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_address_ipv6_scope_id,
            { "IP", "elasticsearch.address.ipv6.scope_id",
                FT_UINT32, BASE_DEC,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_address_port,
            { "Port", "elasticsearch.address.port",
                FT_UINT32, BASE_DEC,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_attributes_length,
            { "Attributes length", "elasticsearch.attributes.length",
                FT_UINT32, BASE_DEC,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_header_token,
            { "Token", "elasticsearch.header.token",
                FT_STRING, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_header_message_length,
            { "Message length", "elasticsearch.header.message_length",
                FT_UINT32, BASE_DEC,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_header_request_id,
            { "Request ID", "elasticsearch.header.request_id",
                FT_UINT64, BASE_DEC,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_header_status_flags,
            { "Status flags", "elasticsearch.header.status_flags",
                FT_UINT8, BASE_HEX,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_header_status_flags_message_type,
            { "Message type", "elasticsearch.header.status_flags.message_type",
                FT_UINT8, BASE_DEC,
                VALS(status_flag_message_type), 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_header_status_flags_error,
            { "Error", "elasticsearch.header.status_flags.error",
                FT_BOOLEAN, BASE_NONE,
                TFS(&tfs_set_notset), 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_header_status_flags_compression,
            { "Compression", "elasticsearch.header.status_flags.compression",
                FT_BOOLEAN, BASE_NONE,
                TFS(&tfs_set_notset), 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_header_size,
            { "Header size", "elasticsearch.header.size",
                FT_UINT32, BASE_DEC,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_header_request,
            { "Request header", "elasticsearch.header.request",
               FT_NONE, BASE_NONE, NULL, 0x0,
               NULL, HFILL }
        },
        { &hf_elasticsearch_header_response,
            { "Response header", "elasticsearch.header.response",
               FT_NONE, BASE_NONE, NULL, 0x0,
               NULL, HFILL }
        },
        { &hf_elasticsearch_header_key,
            { "Key", "elasticsearch.header.key",
               FT_STRING, BASE_NONE, NULL, 0x0,
               NULL, HFILL }
        },
        { &hf_elasticsearch_header_value,
            { "Value", "elasticsearch.header.value",
               FT_STRING, BASE_NONE, NULL, 0x0,
               NULL, HFILL }
        },
        { &hf_elasticsearch_feature,
            { "Feature", "elasticsearch.feature",
               FT_STRING, BASE_NONE, NULL, 0x0,
               NULL, HFILL }
        },
        { &hf_elasticsearch_action,
            { "Action", "elasticsearch.action",
                FT_STRING, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_data,
            { "Data", "elasticsearch.data",
                FT_NONE, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },
        { &hf_elasticsearch_data_compressed,
            { "Compressed data", "elasticsearch.data_compressed",
                FT_NONE, BASE_NONE,
                NULL, 0x0,
                NULL, HFILL
            }
        },

    };

    static int *ett[] = {
        &ett_elasticsearch,
        &ett_elasticsearch_address,
        &ett_elasticsearch_discovery_node,
        &ett_elasticsearch_status_flags,
        &ett_elasticsearch_header,
    };

    static ei_register_info ei[] = {
            { &ei_elasticsearch_unsupported_version, { "elasticsearch.version.unsupported", PI_UNDECODED, PI_WARN, "Unsupported header type: Elasticsearch version < 0.20.0RC1", EXPFILL }},
            { &ei_elasticsearch_unsupported_address_format, { "elasticsearch.address.format.unsupported", PI_MALFORMED, PI_WARN, "Unsupported address format", EXPFILL }},
            { &ei_elasticsearch_unsupported_address_type, { "elasticsearch.address.type.unsupported", PI_MALFORMED, PI_WARN, "Unsupported address type", EXPFILL }},
    };

    expert_module_t*expert_elasticsearch;

    proto_elasticsearch = proto_register_protocol("Elasticsearch", "Elasticsearch", "elasticsearch");

    expert_elasticsearch = expert_register_protocol(proto_elasticsearch);
    expert_register_field_array(expert_elasticsearch, ei, array_length(ei));

    proto_register_field_array(proto_elasticsearch, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));

    elasticsearch_handle_binary = register_dissector("elasticsearch_binary", dissect_elasticsearch_binary, proto_elasticsearch);
    elasticsearch_zen_handle = register_dissector("elasticsearch_zen_ping", dissect_elasticsearch_zen_ping, proto_elasticsearch);

}

void proto_reg_handoff_elasticsearch(void) {

    dissector_add_uint_with_preference("udp.port", ELASTICSEARCH_DISCOVERY_PORT, elasticsearch_zen_handle);
    dissector_add_uint_with_preference("tcp.port", ELASTICSEARCH_BINARY_PORT, elasticsearch_handle_binary);

}

/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
